STOCKHOLM – Swedish police launched an investigation into the bomb attack targeting a Swedish mosque on Monday, treating it as a hate attack against the Muslim minority.

“Windows were broken and the walls were hit by explosives reinforced with BB pellets,” center Chairman Abdihakem Adan told Anadolu Agency.

“An average of 100 people come to the mosque and pray every day.”

The homemade bomb attack hit the Islamic Cultural Center in Saffle, a town 45 kilometers (28 miles) southwest of Karsltad, on Monday.

The bomb left ball-bearings lodged in the walls of the center’s prayer room.

Another racist attack on a mosque in Sodermalm district of Stockholm took place on Tuesday, according to the imam of the mosque.

“In the morning, some unidentified people attached the cross, a symbol of Christians, on the entrance door. They do not want us to be here. They want us to close the mosque,” Khaled Abdel, imam of the Stockholm Mosque, told Anadolu Agency.

Muslims make up between 450,000 and 500,000 of Sweden’s nine million people, according to the US State Department report in 2011.